A "livid" mother has vowed to take legal action after learning her son was one of hundreds of children who received jabs from a suspected unqualified nurse.
Tabitha Rayner's son Luke, three, received seven injections in the summer of 2008 from a woman later arrested on suspicion of fraud.
Detectives are investigating the 46-year-old's work at four GP surgeries in Medway, Kent, from August 2006 to September last year.
Although the woman, who lives in Brecon, mid-Wales,Â has a background as a healthcare assistant, it is suspected that she was not qualified to work as a registered nurse.
More than 1,400 people who received jabs and cervical smears have been contacted by health chiefs.
Miss Rayner, 22, from Chatham, said: "I feel horrified about it.Â I'm absolutely disgusted that the health service could allow someone who allegedly wasn't qualified to give children injections.
Miss Rayner, a student, has spoken to Citizens Advice after receiving the letter from NHS Kent and Medway and is now considering legal action.
Her son's injections were given at a surgery in New Road, Chatham, one of four in the Medway towns where the woman worked over the four-year period.
NHS Kent and Medway said she also worked at a practice in Essex and health authorities there were adopting a similar response.Â Women who had their last cervical smears taken by the woman.
But Dr James Thallon, medical co-director for NHS Kent and Medway, said this week that no problems were found with her work and there is no reason to believe anyone's health has been harmed.